This Ruger No. 1 falling block single action has had a custom stainless steel barrel installed, sans markings, tap for front sight not present. Barrel has a set of scope blocks with one extra tap hole in center. Frame is blued, retaining 90%. Has a long forearm, checkered walnut stock with pistol grip, cap and solid red rubber recoil pad. Missing sling eyes. Bore diameter is .30, we have no idea what cartridge it takes. We tried several common calibers that did not match. Will have to be chamber cast. Serial Number-132-78690; Manufacturer-Ruger; Model-No.1; Caliber-0.3; Barrel Length-22 - 1/2"; FFL Status-Modern;